Aspects of the uptake of dissolved oxygen in Cabiúnas and Imboassica Lagoons (Macaé, RJ)

Brum, Paulo Roberto; Farjalla, Vinicius F.; Gonçalves, José Francisco; Santos, Anderson Medeiros dos; Pôrto, Maurício T.; Vieira, Elisa Diniz Reis; Ferreira, Flávia Monteiro; Bianchini, Irineu

doi:10.1590/s1516-89131999000400008

Cited by 13 publications

(17 citation statements)

References 5 publications

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“…Our results were relatively close to data from aerobic degradation of E. azurea (OC max = 140.0 mg g -1 DM and k D = 0.199 day -1 ) by Bitar and Bianchini Junior (2002) in the Infernão Lagoon. The k D determined in this study was lower than the average value from the aerobic decomposition of macrophytes (Cunha and Bianchini Junior, 1998;Brum et al, 1999;Farjalla et al, 1999;Bitar and Bianchini Junior, 2002). However, from the the deoxygenation coefficient, we infer that the oxygen consumption during degradation of E. azurea is a fast process.…”

Section: Discussioncontrasting

confidence: 61%

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

2014

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This study aimed at describing kinetic aspects of aerobic and anaerobic mineralization of Eicchornia azurea. The samples of aquatic macrophyte and water were collected in the Monjolinho Reservoir (22° 00' S and 47° 54' W). To determine the leachate potential, dried plant fragments were added to reservoir water, with sampling lasting for 4 months, where the particulate and dissolved organic carbon concentrations were measured. The kinetics of mass loss was obtained with 10 mineralization chambers for both aerobic and anaerobic conditions, with the plant fragments and reservoir water. Two additional chambers were used to monitor the volume of gases produced from anaerobic mineralization, with bioassays to determine oxygen uptake. The results were fitted to a first-order kinetic model, from which 27.21% of detritus corresponded to labile/soluble fractions and 72.62% to the refractory fractions. The decay rates for the global mass losses of the labile/soluble components were 2.07 day -1. DOC mineralization was not verified for either condition. Under aerobic condition, the mass loss constant rate (0.0029 day -1 ) for the refractory fractions was 2.4 the value for the anaerobic one. Under anaerobic condition, the gases formation occurred in three phases. Based on these results, in the Monjolinho Reservoir, the decomposition of E. azurea that undergo within the water column and in upper layers of sediment is a faster process, favoring the mineralization. In contrast, in the lower layers of sediment the diagenetic processes (i.e. humus production and accumulation of organic matter) are favored.Keywords: decay, oxygen consumption, gases formation, aquatic macrophyte, Monjolinho Reservoir. Implicações da decomposição aeróbia e anaeróbia de Eichhornia azurea (Sw.)Kunth. na ciclagem de carbono em um reservatório subtropical ResumoNesse estudo descreveram-se aspectos cinéticos da decomposição aeróbia e anaeróbia de Eichhornia azurea. As amostras da macrófita aquática e de água foram coletadas no reservatório do Monjolinho (22° 00' S e 47° 54' O). Para a determinação do potencial de lixiviação, adicionaram-se fragmentos de planta (previamente secos) em água do reservatório. Nos experimentos de decomposição, as amostragens foram realizadas durante 4 meses e quantificaram-se as frações particuladas e dissolvidas de carbono. Para descrever as cinéticas de perda de massa, para cada condição (aeróbia e anaeróbia) foram preparadas 10 incubações contento fragmentos de plantas e água do reservatório. A cada dia de amostragem as frações particuladas e dissolvidas de carbono orgânico foram quantificadas. Foram também preparadas 2 câmaras para registrar a formação de gases da degradação anaeróbia e o consumo de oxigênio na degradação aeróbia. Os resultados foram ajustados a um modelo cinético de 1ª ordem. Verificou-se que 27,21% dos detritos corresponderam à fração lábil/solúvel e 72,62% à refratária. O coeficiente global de perda de massa das frações lábeis/solúveis foi 2,07 dia -1 . Nas duas condições não houve mineralização ...

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Section: Discussioncontrasting

confidence: 61%

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

2014

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“…The mean values of k d estimated from other studies on aerobic mineralization of aquatic plants (Cunha and Bianchini Jr., 1998;Lemos et al, 1998;Brum et al, 1999;Farjalla et al, 1999;Bitar and Bianchini Jr., 2002) were 0.180 per day (half-time = 26 days). This value indicates that, on average, the mineralization process for intact detritus was 5.8 times slower (variation from: 0.014 per day (E. najas) to 0.045 per day (C. furcata).…”

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confidence: 73%

“…(Bitar and Bianchini Jr., 2002), Montrichardia arborescens (Cunha-Santino et al, 2004), Nymphaea ampla (Brum et al, 1999), Potamogeton stenostachys (Brum et al, 1999), Cabomba sp. (Bitar and Bianchini Jr., 2002), Salvinia sp.…”

Section: Resultsmentioning

confidence: 99%

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

Bianchini

2008

Braz. J. Biol.

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This study presents a kinetic model of oxygen consumption during aerobic decomposition of detritus from seven species of aquatic macrophytes: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense and Utricularia breviscapa. The aquatic macrophytes were collected from Óleo Lagoon situated in the Mogi-Guaçu river floodplain (SP, Brazil). Mineralization experiments were performed using the closed bottles method. Incubations made with lake water and macrophytes detritus (500 mL and 200 mg.L -1 (DM), respectively) were maintained during 45 to 80 days at 20 °C under aerobic conditions and darkness. Carbon content of leachates from aquatic macrophytes detritus and dissolved oxygen concentrations were analyzed. From the results we concluded that: i) the decomposition constants differ among macrophytes; these differences being dependent primarily on molecular and elemental composition of detritus and ii) in the short term, most of the oxygen demand seems to depend upon the demineralization of the dissolved carbon fraction.Keywords: aquatic macrophytes, oxygen uptake, oxbow lake and kinetic. Demanda de oxigênio durante a mineralização de macrófitas aquáticas de uma lagoa marginal ResumoNesse estudo foi utilizado um modelo cinético para a descrição dos consumos de oxigênio durante a mineralização aeróbia de detritos de sete espécies de macrófitas aquáticas: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense e Utricularia breviscapa. As macrófitas aquáticas foram coletadas na Lagoa do Óleo, situada na planície de inundação do rio Mogi-Guaçu (SP, Brasil). Os experimentos foram realizados empregando-se incubações similares as de DBO. As incubações foram preparadas com água da lagoa e detritos das macrófitas aquáticas (500 mL e 200 mg.L -1 (PS), respectivamente) e foram mantidas durante 45 a 80 dias a 20 °C, sob condições aeróbias e no escuro. Foram determinados os conteúdos de carbono dos lixiviados dos detritos e os consumos de oxigênio dissolvido durante a mineralização. A partir dos resultados obtidos pôde-se concluir que: i) os coeficientes de mineralização das macrófitas aquáticas diferiram entre si, essas diferenças dependeram principalmente das composições moleculares e elementares dos detritos; e ii) a curto prazo, grande parte da demanda de oxigênio parece depender da mineralização das de carbono dissolvido provenientes da lixiviação.Palavras-chave: macrófitas aquáticas, consumo de oxigênio, lagoa marginal e cinética.

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“…Exponential equations are frequently used in the description of degradation and mineralization processes of terrestrial as well as aquatic ecosystems (Borsuk & Stow, 2000). Although mathematical models that assume the heterogeneity of organic matter in the detritus which employed distinct parameters for describing various constituents of substrate (Mindermann, 1968) have been used, much work has adopted simple exponential models to describe the aerobic mineralization of detritus (Lemos & Bianchini Jr, 1998;Brum et al, 1999;Farjalla et al, 1999;Bitar & Bianchini Jr., 2002). Up to the 20 th day the accumulated consumption was practically the same for all chambers.…”

Section: Resultsmentioning

confidence: 99%

“…Such rates may have also been decreased by the formation of refracting compounds (humic and fulvic acids) favored by the reduction in the detritus size. Taking this into account, it is also possible that as the humification Brum et al, 1999;Farjalla et al, 1999), Potamogeton stenostachys (360.0 and 377.0 mg.g -1 DW; Brum et al, 1999;Farjalla et al, 1999) and Typha domingensis (32.5 mg.g -1 DW; Farjalla et al, 1999). The physical process of fragmentation of O. cubense detritus is unlikely to promote the consumption of higher quantities of dissolved oxygen in the mineralization process and this conclusion may be possibly extrapolated to other aquatic plants.…”

Section: Resultsmentioning

confidence: 99%

The effect of the size of particles on mineralization of Oxycaryum cubense (Poepp. & Kunth) Lye

Bianchini

2006

Braz. J. Biol.

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Assays were carried out to evaluate effects of detritus size on the mineralization of an aquatic macrophyte, the Oxycaryum cubense. Samples of plant and water were collected from an oxbow lake, the Infernão lagoon (21° 35' S and 47° 51' W) located at Mogi Guaçu river floodplain. The plants were taken to the laboratory, washed under tap water, dried (50 °C) and fractioned into six groups according to their size, viz. 100, 10, 1.13, 0.78, 0.61 and 0.25 mm. Decomposition chambers were prepared by adding 1.0 g of plant fragments to 4.1 L of water lagoon. In sequence, the incubations were aerated and the concentrations of dissolved oxygen, the pH, the electric conductivity and the temperature were monitored for 120 days. The occurrence of anaerobic processes was avoided by reoxygenating the solutions. The experimental results were fitted to a first order kinetic model and the consumption of dissolved oxygen from mineralization processes was obtained. The physical process of fragmentation of O. cubense detritus is unlikely to promote the consumption of higher quantities of dissolved oxygen in mineralization processes meaning that fragmentation should not interfere in the balance of DO in this aquatic system, however fragmentation processes favored the acidification and increased the liberation of dissolved ions from the Infernão lagoon.Keywords: mineralization, Oxycaryum cubense, aquatic macrophytes, detritus size. RESUMO O Efeito do Tamanho de Partículas na Mineralização de Oxycaryum cubense (Poepp. & Kunth) LyeEnsaios foram realizados para avaliar os efeitos de tamanho dos detritos na mineralização de uma macrófita aquática, a Oxycaryum cubense. Foram coletadas amostras de planta e de água de uma lagoa marginal, a lagoa do Infernão (21° 35' S e 47° 51' W), localizada na planície de inundação do rio Mogi Guaçu. As plantas foram levadas ao laboratório, lavadas em água corrente, secas (50 °C) e fracionadas em seis grupos de acordo com o tamanho: 100, 10, 1,13, 0,78, 0,61 e 0,25 mm. Foram preparadas câmaras de decomposição adicionando aproximadamente 1,0 g de fragmentos de planta em 4,1 L de água da lagoa. Na seqüência, as incubações foram aeradas e as concentrações de oxigênio dissolvido, o pH, a condutividade elétrica e a temperatura foram monitorados durante 120 dias. A ocorrência de processos de anaeróbios foi evitada por reoxigenação das soluções. Os resultados experimentais foram ajustados a um modelo cinético de primeira ordem e o consumo de oxigênio dissolvido decorrente da mineralização foi obtido. De maneira geral, o processo físico de fragmentação não tende a envolver maiores quantidades de oxigênio durante a mineralização aeróbia dos detritos, significando que a fragmentação não interfere no balanço de oxigênio dissolvido deste sistema aquático; entretanto favoreceu a acidificação e também a liberação de íons dissolvidos na lagoa do Infernão.Palavras-chave: mineralização, Oxycaryum cubense, macrófitas aquáticas, tamanho do detrito. 642 BIANCHINI JR., I. and CUNHA-SANTINO, M. B.

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Aspects of the uptake of dissolved oxygen in Cabiúnas and Imboassica Lagoons (Macaé, RJ)

Abstract: ABSTRACT

Cited by 13 publications

References 5 publications

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

The effect of the size of particles on mineralization of Oxycaryum cubense (Poepp. & Kunth) Lye

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